John Deere says its exclusive heavy-duty TeamMate IV 1400 front and rear axles on its new 643K and 843K wheeled feller bunchers enhance the powertrain's durability, delivering best-in-class stability and hill climbing power in tough conditions.
Powered by a 189-hp (140-kW) John Deere Power Systems 6068H turbocharged diesel, the 643K was designed to handle jobs that range from thinnings and regeneration to biomass harvesting. It is available with an FD45 twin post head for timber with a diameter less than 20 in (508 mm) or an FD22B single post for diameters up to 22 in (559 mm).
Equipped with a more powerful 243-hp (181-kW) 6068H, the 843K is up for more challenging tasks that require the higher power and hydraulics needed to slice through timber, guide the tops, lay down bunches, and back up hills. Deere says the 6068H matched with the 843K allows for improved multifunctioning capabilities and faster cycle times. It is available only with the FD22B.
Both of the feller bunchers feature an infinitely variable hydrostatic transmission with a two-speed gearbox and have a 110-in (2794-mm) wheelbase.
The K-Series features a hydraulically reversing cooling fan that pulls air in from the rear and out through the side panels, automatically blowing pine straw and leaves off the grill screen for better airflow into the engine. Deere says that design also enables the equipment to run much cooler and reduces debris buildup under the cab and around the engine manifold.
Deere says service and maintenance is fast and easy on the K-Series feller bunchers, with a tilting cab that offers "simplified access to the vital components," including the engine. What it describes as a "proven routing pattern" for the hydraulic and electrical plumbing is said to prevent most rubs and leaks for increased hose longevity. A center-load compartment provides easy access to fuses and relays.
A swing-out air-conditioning condenser allows quick cleaning of the hydraulic oil coolers, radiator, and change air cooler. Also contributing to reduced maintenance are hydraulic oil-change intervals of 2000 hours and extended axle-service intervals from 1000 to 2000 hours.